It's very awkward to use a title in place of someone's name. If you put a name after the first instance of "master" and then use the name from then on, it will read better.
The sentences are all very short, and when reading, it sounds rather "choppy." This would be smoother if you combined the short sentences ... like this:
Chuchu is a pet dog whose master, Tom, is an office worker. Tom comes home and is happy because he recently got married. Tom gave food to Chuchu. "Is it good?" Tom asked. "Yes, master, it's delicious," Chuchu seemed to say.